[ussuri][goal] Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Cleanup some old cuft from setup.cfg.
Fix sphinx-build invocation to publish correctly.

Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html

Change-Id: I61b0dcd730be1889815e47a0c0c354d8f7759571

.zuul.yaml

@@ -1,10 +1,8 @@
 - project:
     templates:
       - check-requirements
-      - lib-forward-testing
       - lib-forward-testing-python3
       - openstack-lower-constraints-jobs
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - periodic-stable-jobs
       - publish-openstack-docs-pti

doc/requirements.txt

@@ -4,6 +4,5 @@
 
 # For generating sphinx documentation
 doc8>=0.6.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4'  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0

releasenotes/notes/drop-python-2-7-73d3113c69d724d6.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. The minimum version of Python now
+    supported by automaton is Python 3.6.

setup.cfg

@@ -6,38 +6,17 @@ author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/automaton/latest/
 description-file =
     README.rst
+python-requires = >=3.6
 classifier =
     Development Status :: 3 - Alpha
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Topic :: Software Development :: Libraries
 
-[global]
-setup-hooks =
-    pbr.hooks.setup_hook
-
 [files]
 packages =
     automaton
-
-[nosetests]
-cover-erase = true
-verbosity = 2
-
-[wheel]
-universal = 1
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-warning-is-error = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html

tox.ini

@@ -1,6 +1,6 @@
 [tox]
-minversion = 2.0
-envlist = py27,py37,docs,pep8
+minversion = 3.1.1
+envlist = py37,docs,pep8
 ignore_basepython_conflict = True
 
 [testenv]
@@ -26,7 +26,7 @@ deps =
   -r{toxinidir}/doc/requirements.txt
 commands =
   doc8 --ignore-path "doc/source/history.rst" doc/source
-  sphinx-build -W doc/source doc/build
+  sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:releasenotes]
 deps = {[testenv:docs]deps}